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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* vga.c - driver for VGA graphics adaptor under MS-DOS |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "standard.h" |
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|
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#include <graph.h> |
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|
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#include "driver.h" |
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|
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#include "color.h" |
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|
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#define GAMMA 2.2 /* exponent for color correction */ |
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|
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|
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int vga_close(), vga_clear(), vga_paintr(), vga_comout(), vga_errout(), |
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vga_comin(); |
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|
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static struct driver vga_driver = { |
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vga_close, vga_clear, vga_paintr, NULL, |
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vga_comout, vga_comin, NULL, 1.0 |
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}; |
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|
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static char fatalerr[128]; |
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|
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static struct videoconfig config; |
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|
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extern char *getenv(); |
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|
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|
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struct driver * |
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vga_init(name, id) /* open VGA */ |
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char *name, *id; |
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{ |
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static short mode_pref[] = {_MRES256COLOR, -1}; |
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static short smode_pref[] = {_XRES256COLOR, _SVRES256COLOR, |
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_VRES256COLOR, _MRES256COLOR, -1}; |
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char *ep; |
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register short *mp; |
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|
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mp = !strcmp(name, "vga") ? mode_pref : smode_pref; |
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for ( ; *mp != -1; mp++) |
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if (_setvideomode(*mp)) |
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break; |
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if (*mp == -1) { |
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_setvideomode(_DEFAULTMODE); |
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eputs(name); |
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eputs(": card not present or insufficient VGA memory\n"); |
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return(NULL); |
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} |
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_getvideoconfig(&config); |
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_settextwindow(config.numtextrows-2, 1, |
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config.numtextrows, config.numtextcols); |
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vga_driver.xsiz = config.numxpixels; |
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vga_driver.ysiz = (long)config.numypixels*(config.numtextrows-3) |
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/config.numtextrows; |
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switch (config.mode) { /* correct problems */ |
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case _XRES256COLOR: |
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vga_driver.ysiz -= 16; |
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break; |
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case _MRES256COLOR: |
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vga_driver.pixaspect = 1.2; |
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break; |
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} |
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_setviewport(0, 0, vga_driver.xsiz, vga_driver.ysiz); |
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if ((ep = getenv("GAMMA")) != NULL) /* make gamma map */ |
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make_gmap(atof(ep)); |
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else |
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make_gmap(GAMMA); |
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_remappalette(1, _BRIGHTWHITE); |
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_settextcolor(1); |
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ms_gcinit(&vga_driver); |
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erract[USER].pf = |
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erract[SYSTEM].pf = |
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erract[INTERNAL].pf = |
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erract[CONSISTENCY].pf = vga_errout; |
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erract[COMMAND].pf = vga_comout; |
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if (erract[WARNING].pf != NULL) |
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erract[WARNING].pf = vga_comout; |
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return(&vga_driver); |
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} |
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|
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|
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static |
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vga_close() /* close VGA */ |
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{ |
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ms_gcdone(&vga_driver); |
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_setvideomode(_DEFAULTMODE); |
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erract[USER].pf = /* reset error vector */ |
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erract[SYSTEM].pf = |
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erract[INTERNAL].pf = |
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erract[CONSISTENCY].pf = eputs; |
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erract[COMMAND].pf = NULL; |
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if (erract[WARNING].pf != NULL) |
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erract[WARNING].pf = wputs; |
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if (fatalerr[0]) |
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eputs(fatalerr); /* repeat error message */ |
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} |
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|
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|
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static |
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vga_clear(x, y) /* clear VGA */ |
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int x, y; |
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{ |
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_clearscreen(_GCLEARSCREEN); |
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new_ctab(config.numcolors-2); /* init color table */ |
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} |
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|
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|
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static |
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vga_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */ |
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COLOR col; |
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int xmin, ymin, xmax, ymax; |
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{ |
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extern int vgacolr(); |
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|
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_setcolor(get_pixel(col, vgacolr)+2); |
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_rectangle(_GFILLINTERIOR, xmin, vga_driver.ysiz-ymax, |
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xmax-1, vga_driver.ysiz-1-ymin); |
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vga_driver.inpready = kbhit(); |
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} |
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|
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|
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static |
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vga_comout(s) /* put s to text output */ |
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register char *s; |
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{ |
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struct rccoord tpos; |
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char buf[128]; |
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register char *cp; |
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|
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for (cp = buf; ; s++) { |
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switch (*s) { |
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case '\b': |
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case '\r': |
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case '\0': |
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if (cp > buf) { |
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*cp = '\0'; |
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_outtext(cp = buf); |
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} |
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if (*s == '\0') |
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break; |
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tpos = _gettextposition(); |
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_settextposition(tpos.row, *s=='\r' ? 1 : tpos.col-1); |
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continue; |
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default: |
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*cp++ = *s; |
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continue; |
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} |
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return(0); |
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} |
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fatalerr[0] = '\0'; |
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} |
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|
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|
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static |
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vga_errout(msg) |
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register char *msg; |
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{ |
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static char *fep = fatalerr; |
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|
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_outtext(msg); |
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while (*msg) |
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*fep++ = *msg++; |
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*fep = '\0'; |
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if (fep > fatalerr && fep[-1] == '\n') |
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fep = fatalerr; |
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} |
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|
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|
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static |
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vga_comin(buf, prompt) /* get input line from console */ |
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char *buf; |
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char *prompt; |
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{ |
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extern int getch(); |
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|
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if (prompt != NULL) |
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_outtext(prompt); |
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editline(buf, getch, vga_comout); |
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vga_driver.inpready = kbhit(); |
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} |
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|
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|
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static |
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vgacolr(index, r, g, b) /* enter a color into our table */ |
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int index; |
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int r, g, b; |
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{ |
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register long cl; |
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|
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cl = (long)b<<14 & 0x3f0000L; |
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cl |= g<<6 & 0x3f00; |
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cl |= r>>2; |
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_remappalette(index+2, cl); |
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} |
